Practical Vehicle Testing Techniques That Eliminate Guesswork
Learn the shop-tested electrical and electronic diagnostic methods
trusted by technicians for decades.
The Hands-On Vehicle Testing Reference
Your step-by-step guide to diagnosing electrical and electronic problems using real shop-tested techniques — not guesswork.
This book teaches the essential methods every technician should know.
Amp testing with a meter & inductive pick-up
Computer module & sensor testing
Continuity testing & ohmmeter use
Current paths & shared-current-path diagnostics
Fuel pump & injector testing
Fuse, fusible link & circuit breaker testing
Generator/alternator testing
Relay testing
Starter testing
Battery testing
Voltage drop testing
Meter setup & safety procedures
What Technicians Are Saying
Electrical Bible
🛠 Shop-Tested
Techniques
🏅 GM Instructor-Praised 🔧 Used by Technicians
10+ Years | Beginner-Friendly
Explanations
“Your book was such a great help… I’m no longer afraid to diagnose electrical problems. You taught me more than my teachers at school.”
“This book is unbelievably filled with what I need. The detailed pictures and explanations are the clearest I’ve ever seen. You hit a home run!”
“Your knowledge has transformed me as a technician. Thank you for simplifying concepts that used to confuse me.”
“Joe teaches obtainable knowledge for every type of student. One of the best instructors I’ve ever had.”
Why Electrical Testing Matters
Correct electrical testing eliminates guesswork, prevents unnecessary part replacement, and leads to fast, confident diagnosis. Once you understand how voltage, current, and resistance behave under load, electrical problems become simple and predictable. These shop-proven fundamentals form the core of Joe’s teaching and the foundation of every technique in his book. Mastering these basics transforms any mechanic into a confident electrical troubleshooter.
About Joe Glassford
Joe Glassford is a retired Industrial Arts and Automotive Technology instructor with 29 years of classroom and shop experience. He has trained General Motors technicians, taught electrical systems, and created step-by-step diagnostic methods used by thousands of mechanics. Joe specializes in simplifying electrical testing so any technician — beginner or experienced — can diagnose with confidence.
“Joe teaches obtainable knowledge for every type of student. One of the best instructors I’ve ever had.”
— GM Training Evaluation